Mindflex

Looking at some videos, I see that people can control only the up-down movements of the ball, no other. Not only, really do you think to be able to control a ball like a Jedi Knight?

I think you control not the ball, but an air fan (as explained on the second video). Maybe the EEG data are sent to an air fan, so more brain activity is the equivalent of more air flux, and vice versa. Lateral movements are controlled by a knob.